On Tue, 2003-03-11 at 09:58, Pierre Fortin wrote:
> Get over it... your statement is factually incorrect.... what you are
> probably referring to is the old-style [sub]net broadcast address
>
> Classfull:
> 192.0.0.0: old-style broadcast -- last 0 only (Class C)
> 162.198.0.0: old-style broadcast (Class B)
> 192.0.0.[1-254]: your statement is wrong (Class C)
> 168.0.0.0: old style broadcast -- last two 0s only(Class B)
> 12.12.12.12/255.240.0.0: why not complain about this?
> ^^ ^^^ : subnet = 0 (Class A w/4-bit subnet)
>
> Classless(no subnetting):
> 192.168.1.0/16: valid non-zero host part
> 12.0.1.0/23: valid non-zero host part
> 129.0.0.0/7: valid non-zero host part
>
> Not to mention this is IP part only; not TCP/IP...
In other words, what has to be non zero is the part of the IP that is
not masked. You can always think of the IP as composed by two parts:
The network bits and the host bits.
IP = networkbits.hostbits
For a host, hostbits can not be all 0 (network id) or all 1 (broadcast).
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